PHP 8.0+ compatibility: Undefined property $type from isotope.make

Problem/Motivation

When running drush make the following warning is output in PHP 8.0+ due to a missing library type key:
Undefined property: DrushMakeProject_Library::$type make.project.inc:165

Proposed resolution

Add the $type key, e.g. as done in the slick module in 📌 Undefined property: DrushMakeProject_Library::$type make.project.inc:165 Fixed

Remaining tasks

Review, commit